For a guaranteed no-touch bend, Uri Gellar might still be available.
Seriously, if were my bike, I wouldn't clamp or vise for fear of damaging the tube; I'd adjust it with a brass - faced or similar hammer.
Replacing would be ideal, as suggested, and if within budget, maybe you can add on/correct any additional items!
Hammering and bending are frequently leaps of faith in my experience as a mechanic. On a slightly squashed cable guide on my own bike, I opted to iinternally file it to correct open diameter rather than try to bend it into shape.